Hornfels is the group name for a set of contact metamorphic rocks that have been baked and hardened by the heat of intrusive igneous masses and have been rendered massive, hard, splintery, and in some cases exceedingly tough and durable. [1] .

Hornfels is a fine-grained metamorphic rock that was subjected to the heat of contact metamorphism at a shallow depth. It was "baked" by heat conducted from a nearby magma chamber, sill, dike, or lava flow. Common temperatures for the formation of hornfels range from about 1300 to 1450 degrees Fahrenheit (700 to 800 degrees Celsius).

2023年4月23日 · Hornfels can be almost any color, but black, gray, brown, reddish and greenish rocks are common. It is a type of metamorphic rock that gets its name from its resemblance to animal horn. It forms when magma heats other rock, …

2018年5月30日 · Hornfels is a type of metamorphic rock that gets its name from its resemblance to animal horn. Hornfels forms when magma heats other rock, which may be igneous, metamorphic, or sedimentary. The most common colors of hornfels are black and dark brown.

2025年3月14日 · Hornfels is a fascinating type of metamorphic rock, but what makes it so special? Hornfels forms through contact metamorphism, where heat from magma bakes surrounding rocks, transforming them without melting. This process creates a dense, fine-grained rock with unique properties.

Hornfels is an important rock in the geological world, as it provides a clear indication of the type of metamorphic activity that has occurred in an area. In this article, we will explore the formation, texture, and structure of hornfels in detail.

All of the rocks called hornfels—a hard, fine-grained, flinty rock—are created when heat and fluids from the igneous intrusion alter the surrounding rock, changing its original mineralogy to one that is stable under high temperatures.

marble, granular limestone or dolomite (i.e., rock composed of calcium-magnesium carbonate) that has been recrystallized under the influence of heat, pressure, and aqueous solutions. Commercially, it includes all decorative calcium-rich rocks that can be polished, as well as certain serpentines (verd antiques).

Hornfels are a classified group of contact metamorphic rocks that have been baked under high temperatures by the heat of igneous intrusions and as a result, have become massive, splintery, extremely hard, and in some cases exceedingly tough and durable.

Hornfels is a metamorphic rock formed by the contact between mudstone / shale, or other clay-rich rock, and a hot igneous body, and represents a heat-altered equivalent of the original rock. This process is termed contact metamorphism.